TWO-COLOR IMAGE FORMING METHOD

摘要

PURPOSE:To form a clear two-color image by separating and removing first color toner mixed in second color developer in the system of forming a two- color image by superposing colors on a photoreceptor drum. CONSTITUTION:In the case of separating the first toner mixed, the toner concentration of the second developer in a second developing machine 10 is made high, the first toner is electrostatically charged to have a reverse polarity to second toner and electrically attracted by a separation roll 20 so as to be separated and removed, then the excess second toner is electrically attracted by the roll 20 so as to be recovered and returned to a toner hopper 13. Since the first toner mixed in the second developer is surely separated and removed, the two-color image with less color mixture is formed.